Dogging mechanism for adding-machines.



J. A SMITH; DOGG-ING MECHANISM FOR ADDING MACHINES. APPLfGATION TILED AUG. 22, 1908 Patented July 12, 19 10.

2 SHEETS-SHEET 1.

I J. A. SMITH. DOGGING MECH ANISM FOR ADDING MACHINES. APPLIUATION FILED AUG.22,'1908.

Patented July 12, 1910.

2 BHEETSSHEET 2.

UNITED srn'r rs PATENT OFFICE.

JOHN A, SMITH, 0F HARRISBURG, PENNSYLVANIA, ASSIGNOR T0 ELLIOTT-FISHER COMPANY, 01 HARRISBURG, PENNSYLVANIA, A CORPORATION OF DELAWARE.

DOGGING MECHANISM FOR ADDING-MACHINES.

Specification of Letters Patent.

Patented July 12, 1910.

Application filed August 22, 1908. Serial No. 449,788.

.T 0 all whom it may concern:

Be it known that 1, JOHN A SMrrrr, a citizen of the Un ted States of America, residing at Harristmrg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful lm 'n'ovcments in Dogging Mechanism for Adding- Maohines, of which the following is a specifloat-ion.

This invention relates lo means for dog ging the actuating connections of an adding machine and more particularly to dogging means devised with special retor -nee to its cotiperation with that form of actuating n'icchanism disclosed in Patent No. 829,971 to Lagal'ike and Smith and embraced in the construction of what. is known to cmnmcmc as the Elliott-l isher typewriting and adding machine.

The object of the invention is to provide certain of the. operatingconnections, more particularly those of lower order, with a check dog so arranged that effective reactuation of the operating mechanism will be prevented until the parts ave been properly restored to normal position In the accompanying drawings Figure l is a sectional. elevation of so much of one of the regFi ster opera-ting COIIHBCUOIIS. of an Elliottisher typewritlng and adding machine as is necessary to illustrate the inven-.

tion. F i 2 1s a plan view of the subjectmatter of Fig. 1. Fig. 3 is an elevation of the supporting bracket for one of the connections with a check dog in position. Fig. 4 is an elevation of the subject-matter of Fig. 3 viewed from the opposite side. Fig. 5 is a sectional. elevation of one of the driving ratchcts and its associated parts, the normal position of the driving pawl being indi-' cated in dotted-lines and the. projection or beak of said pawl being shown in section. Fig. 6 is a. similar view With the driving pawl indicated in its fully advanced or 0perated position. Fig. 7 is a. similar view of the upper portion of the structure shown in Fig. '5, showing the parts in the positions they assume just after the retractile movement of the driving pawl is commenced. Fig. 8 is a view similar to Fig. 5, showing the positions a'ssuincd by the parts when the drivln pawl has .been retracted sufficiently to bs ogged by the check dog, and Fig.9 is still'an'other view of this character showmg the positions assumed by the parts when the driving pawl has been sulficiently retractcd to be engaged and dogged by the ratchet flange.

Each part wherever shown is indicated by the same reference numeral.

In order that the conditions whiclrgave rise to the present invention may be propcrly understood, it is first in order "to (lo-- scribe briefly one of the operating connections of an lilliott-l isher machine. It should be in'ldcrstood that the machine referred to is a combined typewriter and adder the traveling carriage of which supports the keys and printing mechanism and. also a master means in the form of a wheel operated from. the typewriter keys and arranged to operate successive number wheels of a register mounted on the relatively stationary frame of the typewriter, all as fully described and shown in the patent to Laganke and Smith hereinbefore identified. The master wheel shaft 1 is revolubly supported. on the carria e, is passed through suitable brackets 2 is arranged to 'be rotated in different degrees by each of a series of operating connections. Each of these connections includes what is termed a driving ratchet 3 fixed to the shaft 1 and arranged tobe engaged and rotated by a driving pawl 1 pivoted at the outer end of a driving arm 5 in the form of a first-class lever fulcrumed on the shaft. 1 and provided. at its opposite end with a toothed segment drneshing with a rack 7 on the rear end of a lever 8 fulcrumed on the carriage of the typewriter and operativcly connected, as at 9, to a second lever 10 fulcrunie'd as at 11 on the carriage and arranged to be swung by a key of the typewriter. So far as the present invention is concerned-however, it

is immaterial how the lever 10 is'operated.

Suffice it. to say that upon the depression of a typewriter key the lever 10 is swung downwardly and the rack 7 on the lever 8 is de-' pressed to swing the drivingarm 5 for the purpose of advancing the driving pawl 4.

At the front end of the pawl 4 is located a. beak or projection 12 which rides under a guard flange 13 on the bracket and engages a tooth of the driving ratchet 3. Further movement of the driving arm serves to-rotate the driving ratchet through the medium of the pawl 4 and thus rotates the shaft 1' and the master wheel (not shown) which in turn operates a denominational member of the pawl is compelled to pass up over the guard flange duringits retractile movement will be clearly apparent by an inspection of Fig. 6 of the drawings. In this figure it will be seen that when thb stroke of the' driving arm has been completed the angular face 3 of a tooth of the driving ratchet 3 will be in position to form a substar tial continuation of the angular face 14: of the most advanced tooth 14 of the ratchet flange 13. As a consequence, the retraction of the driving arm 5 will cause the projection 12 of the driving pawl to ride back over the inclined faces 3 and 14L so that during such retraction the projection on the driving pawl will necessarily pass back over the ratchet flange 13 and will be dogged by the teeth thereof until the retractile movement is completed, after which the pawl resumes its normal position, shown in Fig. 5. Upon the next forward movement of the pawl it rides under the flange 13 to engage and operate the driving ratchet 3. The mechanism thus far. described is characteristic of the Elliott- 'Fisher machine of commerce.

The dogging meckomism.It has been stated that upon the retraction of the driving arm the projection 12 of the pawl 4 rides back over the inclined faces 3" and 1 1 of the teeth of the drivin ratchet 3 and the ratchet flange 13. It wil be apparent that during .this retractile movement the awl is not dogged against reactuation, that 15 to say, the parts are not dogged against forward movement until the projection 12 of the driving pawlhas moved back from the position shown in Fig. 6 to that shown in Fig. 9 and this fact gives rise to the difficulty which my present invention is particularly designed to overcome.

As is well understood by those skilled in the,art, the escapement of the Elliott-Fisher typewriter is operated during the early art of the upward or retractile movement 0 the key to release the carriage. The carriage release is effective while the projection 12 of the driving pawl is moving back to engage a tooth of the flange 13-. Therefore it some times happens that if the key is given two sharp strokes in quick succession the machine will be operated to print and add and willthen escape to the next position and the of the connection digit will be again printed without any corresponding actuation of the register. In other words, if the key is operated a second time before the projection 12 of the driving pawl has moved back a sufiicient distance to engage a tooth of the flange 13, the digit will be printed but the actuating mechanism will not be operated because the false operation will have occurred before the driving pawl has returned to its normal position and in fact before said pawl has moved back a suflicient distance to be dogged by the ratchet flange. In order to overcome this fault, which, while of infrequent occurrence, is obviously obj actionable, I pro vide a swinging check dog 1-5 in osition to engage the projection 12 of the driving pawl and to dog the same against forward movement the instant said projection has moved beyond the rangepf the driving ratchet 3, see Figs. 7 and 8. j v 1 The dog 15 is pivoted at 17 on a bracket 18, preferably secured, as indicated at 19, to the supporting bracket of the particular operating connection to be dogged. The dog 15 is urged toward its dogging position by a. spring 20 and. isprovided adjacent to its rear end with a cam face 21 which overlies the projection 12 of the drivingipawl in' the extreme forward or completely operated position of the latter, see I ig. 6. ,Itfollows therefore that when the connection is retracted the projection 12 as it moves backward will lift the check dog 15, see Fig. 7, the dog dropping behind the projection as s'oon as the latter clears the drlving ratchet and thus effectively dogging the connection against such forward movement as would' serve to effect printing without adding in the event that the same key is o erated before the driving pawl has move back sufficiently to be dogged by the ratchet flange 13.

In Figs. 5 to 9 inclusive, an entire cycle of operation is illustrated. In Fig. 5 the parts are in normal position; in Fig. 6 the driving pawl is shown in its fullyoperated' position; in Fig. 7 the driving pawl is shown in that early stage of its retractile movement during'which it lifts-the check dog 15 out of the path of the projection 12; in Fig. 8 the-check do is shown dro ped into position to check the drivin pawl in Fig. 9 the projection on the pa'w is shown dogged by the ratchet flange, and from this position the parts return to the normal osition shown in Fi .5. It will be seen t erefore that in addition to the usual permanent or stationary ratchet dogging flange 13, the operating connection is provided with an additional movable dog 15 which serves to dog the connection prior to the engagement with the stationary doggmg means.

It isthought that from: the foregoing, the construction, operation and advantages of my dogging device will be clearly comprehended, but I wish to be understood as re serving the right to effect such changes,

modifications or variations of the illustrated structure as may come fairly within the sco 3e of the protection prayed.

I lat I claim is 1. In a device of the character described,

two directions, of a plurality of dogging devices acting successively to dog the member f its movement in one direction, one

during of said dogging devices including a plurality of ratchet teeth.

2. In a device of the character described, the combination with a driving member having an idleretractile movement, of a ratchet device arranged to dog said mem v her during a portion of its *retractile movement, and a movable checlt dog arranged to dog the member prior to the engagement of the same with the ratchet device.

3. In an operatingconnection foradding machines, the combination with a driving ratchet, of a driving pawl arranged to engage and operate.the ratchet, a movable check dog cooperating with the driving pawl, anda stationary dogging device cooperating with thepawl at a dili'ercnt point. in the movement thereof.

4:. In an operating connection for adding machines, the combination with a driving ratchet, a driving pawl cooperating therevwith, a stationary ratchet device tor dog- 'gingthe'driving pawl during a portion of its retractile movement, and a movable check dog enacting with-the driving pawl prior to the engagement of the latter with the ratchet device and yieldablc to permit the movement of the check pawl into position to be (logged by the check dog.

5. In a device of the character described,

the combination with a driving member, of

a ratchet device arranged to dog said member during a portion of its movement in one direction, and a movable check dog arranged to dog the member during the movement of the member in the same direction but prior to the engagement of the same with the ratchet device.

In a device of the character described, the combination with a shaft and a ratchet wheel fixed thereto, of a fixed ratchetflange opposite the periphery of the ratchet wheel a check dog beyond the advanced end of the ratchet tlaiwe, a driving arm swung from the shaft, :1. driving pawl carried by the arm and arranged to engage the ratchet wheel and having a portion thereof disposed to ride under the ratchet flange and the check dog and to ba dogged snctwssively during its rctractiio movement by the check dog and ratchet flange.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN A. SMITH.

Witnesses:

HARRY N. CRUUSH, Ii. I ZERISY. 

